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PekkaNF:
Can you put taper roller bearing(s) at the nose of that spindle? That should have you sorted.

Myford 10 has two oposing taper roll bearings on the spindle and it is pretty good. In theoriy it is not the best, but with two bearings it is pretty damn good for it's price.
http://cdn.instructables.com/F20/AN3I/HH2VZMRF/F20AN3IHH2VZMRF.LARGE.jpg

Much like this:
http://www.lathes.co.uk/elffers/img14.jpg

Here is plain angular front bearing and at the back there is a pair of opposing angular contact bearings:
http://www.myford.co.uk/acatalog/H21.-HEADSTOCK-SPINDLE--A1992-1120.html
http://www.myford.co.uk/acatalog/info_684.html

I think there is a document indicating how this is adjusted. If I remember it correctly first angular ball bearing was adjusted to take up play on front bearing and then second one was "snugged" into it to take up the play on the rear. pretty good at slow speeds, the "nose" bearing limits rpm.

http://www.myford.co.uk/acatalog/Specifications_of_the_Sigma_Lathe.html
This should have some indication of the size of relative parts.

Do I remember wrongly or was the front conical plain bearing was replaced with a single taper roller bearing at any point?

Anyways, if you don't need super high accuracy and very high speed, angular taper roller bearings offer very much load carrying capacity for the money. Yes they are limited on speed range and they are not cheap anymore if you need to buy "Class" over standard wheel bearing standard, and they heat up a bit because they need to be preloaded, but they take up a lot of load and abuse. AND honestly? How many of us can make a spindle and housing to required accuracy that are needed to very expensive "princess" bearings?

IMOHO. Have a good looks on taper roller bearings, design a grease nipple to them (they eat grease) and exit hole, you need seals and that should take care of it.

Pekka
* Typozzzzhh

Fergus OMore:
As a very young Goldstar, I was involved with what was the RAF Antarctic Flight. RAF Hendon- before it became a museum and all that.

But a lathe emerged called the Murad 'Antarctica' and then the 'Bormilathe' which I still want. They are like hen's teeth but one alternative is the modified Myford Super7B of J.A.Radford and the working drawings for his 'Elevatiing Heads' are in his 'Improvements and Accessories for the Lathe' book- published by Tee. Again, his Milling Attachment is also interesting.

Regards

Norman

vtsteam:
Pekka, I uhhh forgot to mention that I uh... also ordered tapered roller bearings to fit.

No, Andrew.

Uhhhhhh 3 bits at a time..... :lol:

But uhhhhhh, I'm not really building a lathe, just checking, you know what the possiblities might be.....

Fergus, I have Radford's book (collected ME articles) with the elevating heads, and he talks about the Bormilathe. The heads on his incredibly modified lathe were chain driven if. I remember correctly.

I couldn't get to sleep last night. I kept imagining how I'd do lathe beds. Now I'm half asleep in the morning and predicted to be the warmest day of the year, so far........

Fergus OMore:

--- Quote from: vtsteam on March 11, 2015, 07:40:48 AM ---
Fergus, I have Radford's book (collected ME articles) with the elevating heads, and he talks about the Bormilathe. The heads on his incredibly modified lathe were chain driven if. I remember correctly.

I couldn't get to sleep last night. I kept imagining how I'd do lathe beds. Now I'm half asleep in the morning and predicted to be the warmest day of the year, so far........

--- End quote ---

This Chain driven idea is repeated by Prof Dennis Chaddock when he made the Quorn.
It is rather interesting because Radford was visited by Geo Thomas in NZ and Chaddock encouraged Thomas to write his things and Thomas and Tubal Cain( Tom Walshaw) used to discuss Model Engineering far into the night at meetings! Then Westbury and LBSC?
Let's not leave out G.P.Potts and his three spindles. I gave one away but still have two.
Then Kenneth C Hart came in as 'Martin Cleeve' and building from only half a new Myford ML7.

It was heady mixture of experts. So I look forward your contribution.

Cheers

Norman

Manxmodder:
"I couldn't get to sleep last night. I kept imagining how I'd do lathe beds. Now I'm half asleep in the morning and predicted to be the warmest day of the year, so far"

Time to get the sun lounger out and have a snooze outside in the warmth........just remember to put your thermals on first :lol: :lol:

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